基于熵权物元模型的青海省土地生态安全评价

为了科学评判生态脆弱区青海省土地资源的生态安全及其变化情况，运用熵权法和P-S-R模型，构建该区域土地生态安全评价指标体系及权重，采用物元理论建立土地生态安全的综合评判模型，并对青海省2000—2010年土地生态安全状况变化情况及空间差异进行了分析。结果表明：青海省土地生态安全的发展趋势大体表现为“较不安全→临界安全”；青海省各市（州、地区）的土地生态安全状况变化情况不尽相同，地区间差异明显；影响青海省土地生态安全水平的主要制约因素包括经济密度、人均耕地面积、林草覆盖率、水土协调度、成灾面积比重和化肥施用量。

Evaluation of Eco-security in Qinghai Province Based on Entropy Weight and Matter Element Model

In order to estimate scientifically land eco-security of ecologically fragile area and it＇s change of cultivated land resources in Qinghai Province, an index system and the corresponding weight values were established based on＂pressure-state-response＂model and entropy weight method, and an integrated evaluation model was constructed with matter element model to evaluate land eco-security of Qinghai Province. Land eco-security change situation was analyzed in Qinghai Province during 2000 to 2010. Results indicated that, the whole level of land eco-security in Qinghai Province improved slightly from relative insecurity to critical security; The change of cultivated land eco-security index was different of each city/state in Qinghai Province and the distinction of different city/state were obvious. The main restriction factors of land eco-security was density of economy, cultivated land area per capita, forest and grass coverage ratio, proportion of natural disaster area and dosage of farmland fertilizer.